Inrush Current

Measured inrush currents were at normal levels under both voltage inputs.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the SX650-G’s efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load in increments of 10 percentage points.

We conducted two additional tests. During the first, we stressed the two minor rails (5V and 3.3V) with a high load, while the load at +12V was only 0.1A. This test reveals whether a PSU is compatible with Intel's C6/C7 sleep states or not. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.

Test #

12V

5V

3.3V

5VSB

DC/AC (Watts)

Efficiency

Fan Speed

PSU Noise

Temps (In/Out)

PF/AC Volts

1

3.576A

1.976A

1.973A

0.981A

64.838

82.269%

1117 RPM

19.4 dB(A)

38.04°C

0.983

12.095V

5.066V

3.341V

5.080V

78.812

46.87°C

115.17V

2

8.189A

2.955A

2.965A

1.181A

129.760

87.294%

1117 RPM

19.4 dB(A)

38.52°C

0.993

12.082V

5.060V

3.334V

5.066V

148.647

47.99°C

115.16V

3

13.156A

3.464A

3.483A

1.381A

194.902

89.754%

1117 RPM

19.4 dB(A)

38.70°C

0.994

12.072V

5.054V

3.328V

5.057V

217.151

50.84°C

115.16V

4

18.128A

3.964A

3.970A

1.583A

259.795

90.430%

1117 RPM

19.4 dB(A)

39.16°C

0.996

12.059V

5.049V

3.321V

5.048V

287.289

54.21°C

115.16V

5

22.775A

4.961A

4.976A

1.786A

324.763

90.430%

1117 RPM

19.4 dB(A)

39.75°C

0.997

12.043V

5.042V

3.313V

5.031V

359.133

57.74°C

115.15V

6

27.436A

5.951A

5.987A

1.991A

389.724

90.114%

1117 RPM

19.4 dB(A)

40.35°C

0.998

12.027V

5.036V

3.306V

5.017V

432.479

59.31°C

115.15V

7

32.109A

6.964A

7.003A

2.196A

454.685

89.461%

1997 RPM

34.1 dB(A)

41.89°C

0.998

12.009V

5.028V

3.296V

5.005V

508.248

61.20°C

115.15V

8

36.796A

7.966A

8.020A

2.401A

519.667

88.794%

2265 RPM

36.8 dB(A)

43.22°C

0.998

11.993V

5.021V

3.290V

4.994V

585.248

62.77°C

115.15V

9

41.934A

8.476A

8.558A

2.404A

584.728

87.917%

2491 RPM

41.0 dB(A)

44.42°C

0.998

11.974V

5.017V

3.283V

4.988V

665.092

65.51°C

115.14V

10

47.041A

8.987A

9.063A

2.508A

649.626

87.191%

2790 RPM

44.7 dB(A)

45.93°C

0.998

11.956V

5.010V

3.276V

4.979V

745.061

68.71°C

115.14V

11

52.553A

8.994A

9.075A

2.510A

714.580

86.381%

2755 RPM

44.6 dB(A)

46.55°C

0.998

11.938V

5.007V

3.271V

4.974V

827.246

72.33°C

115.14V

CL1

0.099A

13.019A

13.006A

0.005A

109.914

81.634%

1117 RPM

19.4 dB(A)

43.82°C

0.992

12.082V

5.047V

3.305V

5.096V

134.642

65.68°C

115.16V

CL2

54.123A

1.003A

1.003A

1.002A

660.507

87.522%

2790 RPM

44.7 dB(A)

45.63°C

0.998

11.956V

5.034V

3.305V

5.039V

754.678

68.88°C

115.15V

The +12V rail demonstrated close to 1.3% deviation, while the 5V rail showed off even tighter load regulation at 1.18%. The 3.3V rail performed well enough at around 2.1%, and the 5VSB rail was at 2.64%.

Up through the 60% load test, SilverStone's SX650-G was nearly silent, despite an ambient temperature in the 38-40°C range. The fan kicked in hard during the 70% load test, though, and under full load it hit its peak speed (and close to 45 dB[A] noise).